feat: added arm64 platform for pr, enabled pr image push

[vku-ibm]

Not 100% sure if this is enough but we can give it a try.
Didn't made changes for cu126 because these versions:

cu126 = [
  "torch>=2.6.0,<=2.6.0",
  "torchvision>=0.21.0",
]

run into conflict with vllm.

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[igobypenn]

I can ran this on an ampere altra server with an nvidia gpu.. and this branch just constantly keeps restarting sayign it Starting production server 🚀
_docling-serve_logs.txt

I ran
docker exec docling-serve nvidia-smi and it does return GPU so it is mounted properly.

Thu Oct  9 06:03:29 2025       
+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 580.65.06              Driver Version: 580.65.06      CUDA Version: 13.0     |
+-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA RTX 2000 Ada Gene...    Off |   00000004:01:00.0 Off |                  Off |
|100%   51C    P2              8W /   70W |    1716MiB /  16380MiB |     18%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI              PID   Type   Process name                        GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|  No running processes found                                                             |
+-----------------------------------------------------------------------------------------+```